4.0 INSTALLATION
4-20
CyberCat 254/1016 Installation Manual
UL S2203
Rev 14, 09/2015
P/N: 06-326
FM
4.16.5.2 CLASS A OR CLASS X WIRING
Exhibit 4-22 shows typical wiring of a supervised and power-limited four-wire SLC that meets NFPA 72, Class
A requirements. This wiring method includes a redundant path. In the event of a single wire break, the
communication to devices after the break continues. This wiring method will NOT support t-tapping. Refer to
NFPA 72 for conductor installation requirements.
4.16.5.3 CLASS X WIRING
Class X wiring is the same as Class A wiring except that it utilizes isolator devices to provide short-circuit
protection for the signaling line circuit (SLC). The circuitry built-into the isolator devices allow communication
to devices to continue past a single short-circuit. Short circuit protection can be provided for the entire
signaling line circuit or for selected sections of the signaling line circuit. If protecting the entire loop, an
isolator device must be installed within 20 feet (6.1 m) of the control panel on both the outgoing and return
wiring. In addition, the wiring between the panel and the first and last isolator devices must be installed in
conduit. Isolator devices can also be used to electrically isolate a zone of detectors and/or modules from the
remainder of the loop by installing an isolator type device at the point where the SLC enters and leaves the
zone. A maximum of 50 devices can be installed between two isolator type devices.
Note:
If using isolator bases, the loop + is separated between terminal 1 (in) and terminal 2 (out).
4.16.5.4 REMOTE LED WIRING
The detector base has the ability to
attach a remote LED as shown in
Exhibit 4-23. Power for operation of the
LED is drawn from the control panel’s
addressable loop. The addressable
loop is limited to a maximum of 100 mA
total for addressable devices plus
remote LED devices.
Exhibit 4-22: Class A SLC Wiring
Exhibit 4-23: Remote LED Wiring
